I was shopping in London yesterday with my other half and popped in to John Lewis. They have a good selection - I was trying out a D750 with 50 f1.4 when the assistant asked me if I had seen the D500? I said no, to which he responded that they had just received one and would I like to have a look?

The phrase 'do bears.......in the woods' came to mind and I think the other staff members were just as excited to see it.
Even though this is a D750 thread I must say that the D500 is an absolutely amazing camera. The build quality, materials, and ergonomics are just fantastic, and firing off 10 fps is something I'd never experienced before. It looks like a next generation camera even before you use it.
I'd say that this is very firmly geared towards fast sports/action and for me, this is a niche camera. I think a used D7200 is absolutely fine for most DX shooters in most situations. For me, I wouldn't be able to justify a D500 since I don't do much action photography; the D750 would still be a better choice. However, both D750 and D500 are very much future-proofed cameras and I can see some people using both.